How did the ptolemaic model differ from other proposed solar system models? .

Claudius Ptolemy was an Alexandrian astronomer who lived around 100 AD. His model of the universe and the solar system was a refinement of earlier Greek models. These models assumed that all bodies in the universe must move in the most perfect path: a circle. Ptolemy believed that the bodies' circular motions were caused by their being attached to unseen revolving solid spheres. Although his assumption was mistaken, it would eventually lead Johannes Kepler to the correct elliptical model.

The Ptolemaic model, just like earlier ones, was a geocentric model. This meant that it placed the Earth at the center of the solar system. This mode persisted with minor adjustments until it was displaced in the 16th and 17th century by the Copernican system, which placed the sun at the centre.

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